WO2016159846A1 - Agencement de transmission pour un véhicule - Google Patents

Agencement de transmission pour un véhicule Download PDF

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Publication number
WO2016159846A1
WO2016159846A1 PCT/SE2015/050401 SE2015050401W WO2016159846A1 WO 2016159846 A1 WO2016159846 A1 WO 2016159846A1 SE 2015050401 W SE2015050401 W SE 2015050401W WO 2016159846 A1 WO2016159846 A1 WO 2016159846A1
Authority
WO
WIPO (PCT)
Prior art keywords
planetary
transmission arrangement
ring gear
vehicle
arrangement
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/SE2015/050401
Other languages
English (en)
Inventor
Stefan ANDREASSON
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Volvo Construction Equipment AB
Original Assignee
Volvo Construction Equipment AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Volvo Construction Equipment AB filed Critical Volvo Construction Equipment AB
Priority to PCT/SE2015/050401 priority Critical patent/WO2016159846A1/fr
Publication of WO2016159846A1 publication Critical patent/WO2016159846A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines
    • B60K6/08—Prime-movers comprising combustion engines and mechanical or fluid energy storing means
    • B60K6/12—Prime-movers comprising combustion engines and mechanical or fluid energy storing means by means of a chargeable fluidic accumulator
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2300/00—Indexing codes relating to the type of vehicle
    • B60W2300/17—Construction vehicles, e.g. graders, excavators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00—Type of vehicle
    • B60Y2200/40—Special vehicles
    • B60Y2200/41—Construction vehicles, e.g. graders, excavators
    • B60Y2200/415—Wheel loaders
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/62—Hybrid vehicles

Definitions

  • the present invention relates to a transmission arrangement for a vehicle.
  • the invention also relates to a vehicle comprising such a transmission arrangement, a method for controlling the transmission arrangement, and a control unit for controlling the transmission arrangement.
  • the invention is applicable on vehicles, in particularly working machines such as e.g. wheel loaders, articulated haulers, etc. Although the invention will mainly be described in relation to a wheel loader, it is also applicable for other type of vehicles such as e.g. trucks.
  • a working machine In connection with transportation of heavy loads at construction sites or the like, a working machine is often used.
  • the working machines may be utilized for transports in connection with road or tunnel building, sand pits, mines, forestry and similar environments.
  • the working machine is frequently operated with large and heavy loads in rough terrain and on slippery ground where no regular roads are present.
  • high quality of the driveline is necessary and the driveline must be sufficiently robust and sustainable in order to function properly well in the relatively rough terrain.
  • the driveline comprises a prime mover which is arranged to propel the vehicle, a gearbox for adjusting the speed and strength of the vehicle in dependency of the specific driving scenario, and a torque converter arranged between the prime mover and the gearbox for increasing the torque from the prime mover to the gearbox at situations when this is desirable.
  • a torque converter is often used in the described rough terrain of the working machine.
  • the object is at least partly achieved by a transmission arrangement according to claim 1 .
  • a transmission arrangement for a vehicle comprising a planetary gear set comprising a first planetary member connectable to a prime mover of the vehicle, a second planetary member connectable to a gearbox of the vehicle, and a planetary ring gear, wherein the transmission arrangement comprises a reversible energy transmitting unit connectable to the planetary ring gear for transmitting energy to or from the planetary gear set.
  • reversible energy transmitting unit should in the following and throughout the entire description be interpreted as a unit which is able to receive energy from the planetary gear set. The energy may then be further transmitted to an energy storage device of suitable kind.
  • the "reversible energy transmitting unit” should also be interpreted as a unit which is able to transmit energy to the planetary gear set.
  • energy stored in the suitable energy storage device can be provided to the reversible energy transmitting unit which transmits the energy to the planetary gear set via the planetary ring gear. Hence, when the energy is transmitted to the planetary ring gear, the energy is further transmitted to the driveline of the vehicle.
  • the reversible energy transmitting unit may comprise a machine which can be, for example, a hydraulic machine or an electric machine.
  • a machine which can be, for example, a hydraulic machine or an electric machine.
  • the hydraulic machine can receive energy from the planetary gear set by acting as a hydraulic pump and thus reduce the speed of the ring gear.
  • hydraulic fluid is transmitted from the hydraulic machine to the energy storage device, which may be a hydraulic accumulator and/or another hydraulic machine.
  • the hydraulic machine can also transmit energy to the planetary gear set via the planetary ring gear.
  • the hydraulic machine acts as a hydraulic motor which transmits energy to the planetary ring gear.
  • the electric machine can act as a generator which receives energy from the planetary gear set when reducing the speed of the planetary ring gear. In such a case, the energy can be further transmitted to a storage device in the form of a battery.
  • the electric machine can also act as an electric motor for transmitting energy to the planetary gear set.
  • energy is provided from the battery to the electric machine which in turn transmits energy to the planetary gear set.
  • the wording "connectable to” should not be construed as limited to a device/part being directly connectable to another device/part.
  • the first planetary member does not necessarily have to be directly connectable to the prime mover of the vehicle, since other parts may be arranged between the first planetary member and the prime mover, such as e.g. transmission shafts or gear wheels, etc.
  • the second planetary member does not have to be directly connectable to the gearbox of the vehicle.
  • Advantages of the present invention is that the need of a torque converter is reduced since the use of the reversible energy transmitting unit in combination with the planetary gear set will provide similar functions as a torque converter.
  • a torque converter is often associated with power losses and the present invention thus at least partially mitigates this problem.
  • the reversible energy transmitting unit is controlled to receive energy from the planetary gear set. This is executed by reducing the rotational speed of the planetary ring gear.
  • the planetary ring gear will thus slip or be provided in a stand-still configuration.
  • the torque delivered from the planetary gear set to the gearbox will be increased in comparison to the torque transmitted from the prime mover of the vehicle to the planetary gear set.
  • the transmission arrangement may comprise a braking arrangement for braking the planetary ring gear.
  • a braking arrangement By also connecting a braking arrangement to the planetary gear set has the advantage that the braking arrangement can complement the reversible energy transmitting unit when reducing the speed of the planetary ring gear.
  • the size, or power, of the reversible energy transmitting unit can be reduced, while still accomplishing the torque increasing effect.
  • the brake when reducing the speed of the planetary ring gear, the brake is at least partially engaged and the reversible energy transmitting unit is arranged in an energy receiving mode, so that the speed of the planetary ring gear is reduced.
  • a still further aspect of using a braking arrangement in combination with the reversible energy transmitting unit is that a smaller braking arrangement can be used compared to only having a braking arrangement and not including a reversible energy transmitting unit.
  • the braking arrangement may be arranged for braking the planetary ring gear relative to a gearbox housing of the gearbox.
  • a first portion of the braking arrangement may be arranged on the planetary ring gear and a second portion of the braking arrangement may be arranged on a gearbox housing of the gearbox, wherein the first portion engages with the second portion when braking the planetary ring gear.
  • the braking arrangement may be connected to the gearbox housing of the vehicle which is a relatively robust part arranged in close proximity to the planetary gear set.
  • the braking arrangement may however also be connected to other parts of the vehicle, such as e.g. the vehicle frame.
  • the braking arrangement may be a friction disc clutch.
  • the friction disc clutch may be a wet friction disc clutch.
  • a friction disc clutch is a well suited braking arrangement since it can be arranged in a lock-up mode, where the planetary ring gear is held stationary in relation to e.g. the gearbox housing.
  • the friction disc clutch can also be positioned in a slip mode, where the planetary ring gear has a relative motion with regards to e.g. the gearbox housing.
  • the slip mode the rotational speed of the planetary ring gear is reduced while still having a relative motion with regards to the gearbox housing.
  • using a wet friction disc clutch arrangement may provide for an extended lifetime of the friction disc clutch compared to a dry friction disc clutch, since the friction of a wet friction disc clutch is lower compared to a dry friction disc clutch.
  • the reversible energy transmitting unit may comprise a machine operable to transmit and receive energy to or from the planetary gear set.
  • the machine can also provide energy to the planetary gear set.
  • the machine can also transmit energy to the planetary ring gear so that the rotational speed of the input shaft of the gearbox is increased.
  • further speed of the gearbox can be provided without overrunning the prime mover of the vehicle. This means that the prime mover can be operated at lower rotation speed which in turn reduces the fuel consumption of the vehicle.
  • the machine may be a hydraulic machine.
  • a hydraulic machine may be advantageous to use for working machines which already uses a hydraulic system to control, for example, hydraulic actuators to raise and lower hydraulic cylinders, etc.
  • the hydraulic machine arranged for the transmission arrangement may be arranged in fluid communication with other hydraulic components of the working machine.
  • Other machines are of course conceivable, such as an electric machine which can be operated as an electric motor or as an electric generator, or a flywheel arranged to receive and transmit energy to/from the planetary gear set.
  • the reversible energy transmitting unit may comprise a hydraulic accumulator in fluid communication with the hydraulic machine.
  • hydraulic fluid can be provided to the hydraulic accumulator when the hydraulic machine acts as a hydraulic pump and receives energy from the planetary gear set, i.e. when the hydraulic machine is braking the planetary ring gear.
  • the hydraulic accumulator can be arranged as a storage means for the hydraulic fluid.
  • the hydraulic machine acts as a motor to further propel the planetary gear set in order to increase the rotational speed of the input shaft of the gearbox as described above, the hydraulic machine can be driven by hydraulic fluid from the hydraulic accumulator for transmitting energy to the planetary gear set.
  • the transmission arrangement may comprise a gear wheel, wherein the reversible energy transmitting unit is connectable to the planetary ring gear via the gear wheel.
  • a further gear split can be provided between the planetary ring gear and the reversible energy transmitting unit.
  • the gear wheel simplifies the connection to the planetary ring gear.
  • the gear wheel may be in meshed connection with external gears of the planetary ring gear.
  • a specific gear ratio between the planetary ring gear and the reversible energy transmitting unit is provided.
  • Other alternatives are of course also conceivable, such as a belt transmission arranged between the planetary ring gear and the reversible energy transmitting unit, or a shaft which is arranged in connection with the externally arranged surface of the planetary ring gear and which transfers a rotational motion to the reversible energy transmitting unit by means of friction between the shaft and the externally arranged surface of the planetary ring gear.
  • the transmission arrangement may comprise a clutch, wherein the reversible energy transmitting unit is connectable to the planetary ring gear via the clutch.
  • the reversible energy transmitting unit can be disconnected from the planetary gear set.
  • the transmission arrangement may comprise a clutch arrangement, wherein one of the first planetary member, the second planetary member and the planetary ring gear is connectable to another one of the first planetary member, the second planetary member and the planetary ring gear via the clutch arrangement.
  • the first planetary member may be a planetary sun wheel
  • the second planetary member may be a planet carrier comprising a plurality of planet gear wheels.
  • a fixed 1 :1 ratio is provided between the planetary sun gear and the planet carrier.
  • the planet carrier is fixedly connected to the planetary ring gear, a fixed 1 :1 ratio is provided between the planet carrier and the planetary ring gear.
  • An advantage of connecting the components of the planetary gear set to each other is that a fixed 1 :1 ratio of the rotational speed transmitted from the prime mover and the rotational speed of the input shaft of the gearbox is provided when there is no need of increasing the torque into the gearbox.
  • a vehicle comprising a prime mover, a gearbox, and a transmission arrangement
  • the transmission arrangement comprises a planetary gear set comprising a first planetary member connected to the prime mover, a second planetary member connected to the gearbox, and a planetary ring gear
  • the transmission arrangement comprises a reversible energy transmitting unit connectable to the planetary ring gear for transmitting energy to or from the planetary gear set.
  • the reversible energy transmitting unit comprises a first hydraulic machine, wherein the vehicle further comprises a second hydraulic machine arranged in fluid communication with at least one hydraulic actuator of the vehicle, wherein the first hydraulic machine is arranged in fluid communication with the second hydraulic machine.
  • hydraulic fluid can be provided to/from the second hydraulic machine of the vehicle.
  • the first hydraulic machine acts as a hydraulic pump and delivers hydraulic fluid to the second hydraulic machine, which can use the hydraulic fluid to e.g. activate the at least one hydraulic actuator.
  • hydraulic fluid can be provided from the second hydraulic machine to the first hydraulic machine which then acts as a motor to propel the planetary ring gear.
  • the hydraulic actuator may, for example, be a hydraulic cylinder of the vehicle.
  • a method for controlling a transmission arrangement of a vehicle comprising a planetary gear set comprising a first planetary member connected to a prime mover of the vehicle, a second planetary member connected to a gearbox of the vehicle, and a planetary ring gear, wherein the transmission arrangement further comprises a reversible energy transmitting unit connectable to the planetary ring gear, the method comprising the steps of receiving a signal indicative of a requested increase of torque or a requested increase of the rotational speed to the drive line of the vehicle, and controlling the reversible energy transmitting unit to receive energy from the planetary ring gear if the received signal indicates a requested increase of torque, for obtaining an increased output torque from the transmission arrangement, or controlling the reversible energy transmitting unit to transmit energy to the planetary ring gear if the received signal indicates a requested increase of the rotational speed, for obtaining an increased rotational speed of an output shaft of the transmission arrangement.
  • the reversible energy transmitting unit can either transmit or receive energy to/from the planetary gear set in order to either increase the torque from the transmission arrangement, or to increase the rotational speed of an output shaft of the transmission arrangement.
  • a control unit of the vehicle receives a signal or an indication that further torque is needed, or an increase of the rotational speed is desired.
  • the transmission arrangement may comprise a braking arrangement connected to the planetary ring gear, wherein the method comprises the step of braking the planetary ring gear using the braking arrangement if the received signal indicates a requested increase of torque.
  • a control unit for controlling a transmission arrangement of a vehicle, the transmission
  • the transmission arrangement further comprises a reversible energy transmitting unit connectable to the planetary ring gear
  • the control unit is configured to receive a signal indicative of a requested increase of torque or a requested increase of the rotational speed to the drive line of the vehicle, and control the reversible energy transmitting unit to receive energy from the planetary ring gear if the received signal indicates a requested increase of torque, for obtaining an increased output torque from the transmission arrangement, or control the reversible energy transmitting unit to transmit energy to the planetary ring gear if the received signal indicates a requested increase of the rotational speed, for obtaining an increased rotational speed of an output shaft of the transmission arrangement.
  • a computer program comprising program code means for performing any of the method steps described above in relation to the third aspect of the present invention when the program is run on a computer.
  • a computer readable medium carrying a computer program comprising program code means for performing any of the method steps described above in relation to the third aspect of the present invention when the program is run on a computer.
  • Fig. 1 is a lateral side view illustrating a working machine in the form of a wheel loader having an implement for loading operations, and a hydraulic system for operating the implement and steering the wheel loader;
  • Fig. 2 is a schematic view of a transmission arrangement according to an example embodiment of the present invention;
  • Fig. 3 is a schematic view of a transmission arrangement according to another example embodiment of the present invention.
  • Fig. 4 is a flow chart of a method for controlling the transmission arrangement depicted in Figs. 2 and 3 according to an example embodiment of the present invention.
  • DETAIL DESCRIPTION OF EXAMPLE EMBODIMENTS OF THE INVENTION The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided for thoroughness and completeness. Like reference character refer to like elements throughout the description.
  • Fig. 1 is a lateral side view illustrating a vehicle 101 in the form of a working machine.
  • the working machine is in Fig. 1 a wheel loader having an implement 102 for loading operations.
  • the term "implement" is intended to comprise any kind of tool using hydraulics, such as a bucket, a fork or a gripping tool arranged on a wheel loader, or a container arranged on an articulated hauler.
  • the implement illustrated in Fig. 1 comprises a bucket 103 which is arranged on an arm unit 104 for lifting and lowering the bucket 103.
  • the bucket 103 can also be tilted or pivoted relative to the arm unit 104.
  • the wheel loader is provided with a hydraulic system comprising at least one hydraulic machine (not shown).
  • the wheel loader 101 further comprises two hydraulic actuators in the form of hydraulic cylinders 105a, 105b for the operation of the arm unit 104 and a hydraulic actuator in the form of a hydraulic cylinder 106 for tilting the bucket 103 relative to the arm unit 104.
  • the hydraulic system comprises hydraulic actuators in the form of steering cylinders 107a, 107b for turning the wheel loader by means of relative movement of a front body 108 and a rear body 109.
  • the working machine is frame-steered by means of the steering cylinders 107a, 107b.
  • the wheel loader depicted in Fig. 1 comprises, as is depicted in further detail in Figs.
  • a prime mover 206 for propelling the working machine a gearbox 210, and a transmission arrangement 200 arranged between the prime mover 206 and the gearbox 210 for either increasing the torque supplied to the gearbox 210 or increasing the rotational speed of the input shaft of the gearbox 210.
  • a wheel loader is depicted in Fig. 1
  • an articulated hauler is equally applicable for using the present invention as will be described below with reference to Figs. 2 - 4.
  • Fig. 2 schematically illustrates the transmission arrangement 200 according to an example embodiment of the present invention.
  • the transmission arrangement 200 is connected to the prime mover 206 of the vehicle.
  • the transmission arrangement 200 is in turn connected to the gearbox 210 of the vehicle.
  • the prime mover 206 can, for example, be an internal combustion engine which uses any suitable propellant to operate.
  • the transmission arrangement 200 is arranged in downstream
  • the transmission arrangement 200 is connected to a control unit 215 arranged to control the transmission arrangement.
  • the transmission arrangement 200 comprises a planetary gear set 202, a reversible energy transmitting unit 214, a braking arrangement 216, a gear wheel 220 connecting the planetary gear set 202 to the reversible energy transmitting unit 214 and an energy storage means 218 arranged in communication with the reversible energy transmitting unit 214.
  • the planetary gear set 202 comprises a first planetary member 204, a second planetary member 208 and a planetary ring gear 212.
  • the first planetary member 204 is in the illustrated example embodiment a planetary sun gear and will also in the following be described as a planetary sun gear.
  • the second planetary member 208 is in the illustrated example embodiment a planet carrier 208 and will also in the following be described as a planet carrier 208.
  • the sun wheel 204 of the planetary gear set 202 is connected to the prime mover 206 of the vehicle and the planet carrier 208, which comprises a plurality of planet wheels 207, is connected to the gearbox 210, while the planetary ring gear 212 is connected to the reversible energy transmitting unit 214.
  • the planetary ring gear 212 is connected to the reversible energy transmitting unit 214 via the gear wheel 220, or more specifically, gears of the gear wheel 220 is in meshed connection with externally arranged gears of the planetary ring gear.
  • Other arrangements for connecting the planetary ring gear to the reversible energy transmitting unit 214 are of course conceivable as described above.
  • the reversible energy transmitting unit 214 comprises in the example embodiment depicted in Fig. 2 a hydraulic machine.
  • the energy storage means 218 is in the example embodiment a hydraulic accumulator.
  • the hydraulic machine can receive energy from the planetary gear set 202 via the planetary ring gear 212. This is executed by braking planetary ring gear 212 using the hydraulic machine which then acts as a hydraulic pump that supplies hydraulic fluid to the hydraulic accumulator.
  • the hydraulic machine can also act as a motor in order to transmit energy to the planetary gear set 202. In such a case, hydraulic fluid is supplied from the hydraulic accumulator to the hydraulic machine for additional propulsion of the planetary gear set 202. Hence, the hydraulic machine is driven by hydraulic fluid from the hydraulic accumulator.
  • a hydraulic accumulator 218 is depicted as an energy storage device for the hydraulic machine
  • a second hydraulic machine of the working machine which second hydraulic machine is arranged to control the hydraulic cylinders 105a, 105b, 106, 107a, 107b of the working machine.
  • the second hydraulic machine drives the first hydraulic machine by supplying hydraulic fluid to the first hydraulic machine which then provides energy to the planetary gear set.
  • the first hydraulic machine acts as a pump and supplies hydraulic fluid to the second hydraulic machine which then acts as a motor to drive e.g. hydraulic actuators of the vehicle.
  • a hydraulic accumulator may also be used in combination with the first and second hydraulic machines.
  • hydraulic fluid can be supplied to the hydraulic accumulator which, when the other one of the first and the second hydraulic machine is arranged to operate as a hydraulic motor, drives that hydraulic machine by supplying hydraulic fluid thereto.
  • the reversible energy transmitting unit 214 may instead comprise an electric machine which can act as a generator when braking the planetary gear set 202 which then transmits energy to a battery, or as an electric motor when providing additional propulsion to the planetary gear set 202.
  • the transmission arrangement comprises, as described above, a braking arrangement 216.
  • the braking arrangement 216 is arranged to assist in reducing the rotational speed of the planetary ring gear 212.
  • the braking arrangement 216 is thus arranged between the planetary ring gear 212 and a stationary part of the vehicle, such as e.g. the gearbox housing 217 of the gearbox 210.
  • the braking arrangement 216 is configured to assist in reducing the speed of the planetary ring gear 212 when it is desirable to increase the torque from the prime mover 206 to the gearbox 210, which will be described further below.
  • the transmission arrangement 200 also comprises a clutch arrangement 222.
  • the clutch arrangement 222 is arranged to connect parts of the planetary gear set 202 to each other for providing a 1 :1 gear ratio between the connected parts as well as between the prime mover drive shaft 205 and the input shaft 21 1 of the gearbox 210.
  • the clutch arrangement 222 is positioned between the planetary sun gear 204 and the planet carrier 208.
  • a gear ratio of 1 :1 is provided between the planetary sun gear and the planet carrier.
  • the rotational speed of the input shaft 21 1 of the gearbox 210 is equal to the rotational speed of a prime mover drive shaft 205.
  • the clutch arrangement 222 can, instead of or additional to the position depicted in Fig. 2, be arranged between the planetary sun gear 204 and the planetary ring gear 212, which thus provides for a 1 :1 gear ratio between the planetary sun gear 204 and the planetary ring gear 212, or between the planet carrier 208 and the planetary ring gear 212, which thus provides for a 1 :1 gear ratio between the planet carrier 208 and the planetary ring gear 212.
  • the control unit 215 receives an indication whether the vehicle is in need of an increased torque or an increased rotational speed of the input shaft 21 1 of the gearbox 210. For example, during startup of the working machine or during steep uphill driving, there may be a need to increase the torque to the driveline of the vehicle. On the other hand, during e.g. downhill driving there may be a need to further increase the rotational speed of the input shaft 21 1 of the gearbox 210 in comparison to the rotational speed of the prime mover drive shaft 205 of the prime mover 206. The following will describe the two scenarios separately below.
  • the control unit 215 of the vehicle thus receives a signal that there is a desired need to increase the torque in order to manage the current driving situation.
  • the rotational speed of the planetary ring gear should be reduced. This is accomplished by reducing the speed of the planetary ring gear by using the hydraulic machine as a hydraulic pump and at the same time engaging the braking arrangement 216.
  • the braking arrangement 216 does not necessarily have to be fully engaged to achieve the desired result.
  • the hydraulic machine supplies hydraulic fluid to the hydraulic accumulator 218.
  • the hydraulic machine may be utilized to provide approximately 75% of the braking capacity and the braking arrangement 216 may be utilized to provide the remaining 25% of the braking capacity to reduce the rotational speed of the planetary ring gear 212.
  • the control unit 215 thus receives a signal that there is a desired need to increase the rotational speed of the input shaft 21 1 of the gearbox 210. This may be the case in situations where the prime mover is not able to deliver further rotational speed as desired, such as e.g. during downhill driving.
  • the hydraulic machine is driven by hydraulic fluid from the hydraulic accumulator for transmitting energy to the planetary gear set 202, wherein the hydraulic machine thus acts as a hydraulic motor. More specifically, the hydraulic machine delivers energy to the planetary ring gear 212 such that further rotational speed is provided to the planet carrier and to the input shaft 21 1 of the gearbox 210.
  • Fig. 3 is a schematic view of a transmission arrangement according to an example embodiment of the present invention.
  • the difference between the transmission arrangement 300 depicted in Fig. 3 and the transmission arrangement 200 depicted in Fig. 2 is that the transmission
  • Fig. 3 comprises a clutch 302 arranged between the hydraulic machine and the planetary gear set 202. More specifically, the clutch 302 in the illustrated example embodiment of Fig. 3 is positioned between the hydraulic machine and the gear wheel 220 which is in meshed connection with the planetary ring gear 212.
  • the purpose of the clutch 302 is to be able to disconnect the hydraulic machine from the planetary gear set 202. Hence, when the clutch is disengaged, no energy is delivered to/from the hydraulic machine. Hereby, when there is no need to either increase the rotational speed or increase the torque of the input shaft 21 1 of the gearbox 210, the hydraulic machine can be disengaged in order to minimize power losses of the system.
  • Fig. 4 illustrates a flow chart of a method for controlling the above described transmission arrangement according to an example embodiment of the present invention.
  • a signal is received S1 which indicates that it is desirable to increase the torque of the gearbox 210 of the vehicle 101 or that it is desirable to increase the rotational speed of the input shaft 21 1 of the gearbox 210.
  • the control unit 215 receives a signal from a component or arrangement of the vehicle.
  • the signal comprises information regarding the driving scenario of the vehicle. If, for example, the vehicle is driving in a steep uphill slope, the signal may contain information stating that the driveline of the vehicle is in need of an increased torque, i.e. the torque on the input shaft 21 1 of the gearbox 210 should be increased in relation to the torque transmitted from the prime mover 206 of the vehicle.
  • the signal may contain information stating that the driveline of the vehicle is in need of an increased rotational speed, i.e. the rotational speed of the input shaft 21 1 of the gearbox 210 should be increased in relation to the rotational speed transmitted from the prime mover 206.
  • the reversible energy transmitting unit 214 receives S2 energy from the planetary gear set 202. More specifically, the reversible energy transmitting unit 214 receives energy from the planetary ring gear 212 of the planetary gear set 202. This is accomplished by reducing the rotational speed of the planetary ring gear, which thus also reduces the rotational speed of the planet carrier 208. Hereby, the torque provided from the planetary gear set 202 to the gearbox 210 is increased in relation to the torque transmitted from the prime mover 206 to the planetary gear set 202. Moreover, in order to assist the reversible energy transmitting unit 214 to reduce the rotational speed of the planetary ring gear 212, the braking arrangement 216 may also be at least partially engaged to brake S4 the planetary ring gear 212.
  • the reversible energy transmitting unit 214 transmits energy to the planetary gear set 202. More specifically, the reversible energy transmitting unit 214 transmits energy to the planetary ring gear 212 such that the rotational speed of the planetary ring gear is increased, which thereby increases the rotational speed of the planet carrier 208 and thus the rotational speed of the input shaft 21 1 of the gearbox 210.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Structure Of Transmissions (AREA)

Abstract

La présente invention concerne un agencement de transmission (200, 300) pour un véhicule, l'agencement de transmission comprenant un ensemble d'engrenages planétaires (202) comprenant un premier élément planétaire (204) pouvant être connecté à un moteur principal (206) du véhicule, un second élément planétaire (208) pouvant être connecté à une boîte de vitesses (210) du véhicule, et une couronne dentée planétaire (212), l'agencement de transmission (200, 300) comprenant une unité de transmission d'énergie réversible (214) pouvant être connectée à la couronne dentée planétaire pour transmettre de l'énergie vers ou depuis l'ensemble d'engrenages planétaires. L'invention concerne également un véhicule (101) comprenant un tel agencement de transmission, un procédé pour commander l'agencement de transmission et une unité de commande pour commander l'unité de transmission.
PCT/SE2015/050401 2015-03-31 2015-03-31 Agencement de transmission pour un véhicule Ceased WO2016159846A1 (fr)

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Application Number Priority Date Filing Date Title
PCT/SE2015/050401 WO2016159846A1 (fr) 2015-03-31 2015-03-31 Agencement de transmission pour un véhicule

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Application Number Priority Date Filing Date Title
PCT/SE2015/050401 WO2016159846A1 (fr) 2015-03-31 2015-03-31 Agencement de transmission pour un véhicule

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WO2016159846A1 true WO2016159846A1 (fr) 2016-10-06

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PCT/SE2015/050401 Ceased WO2016159846A1 (fr) 2015-03-31 2015-03-31 Agencement de transmission pour un véhicule

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Cited By (2)

* Cited by examiner, † Cited by third party
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WO2018202314A1 (fr) * 2017-05-05 2018-11-08 Volvo Construction Equipment Ab Transmission de machine de travail
GB2632871A (en) * 2023-08-25 2025-02-26 Bamford Excavators Ltd Transmission

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WO2009057082A2 (fr) * 2007-11-01 2009-05-07 Ducere Holdings (Pty) Limited Dispositif d'entraînement à mécanisme hydraulique à boucle ouverte pouvant fonctionner comme pompe ou comme moteur
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018202314A1 (fr) * 2017-05-05 2018-11-08 Volvo Construction Equipment Ab Transmission de machine de travail
GB2632871A (en) * 2023-08-25 2025-02-26 Bamford Excavators Ltd Transmission

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